It seems like the Intel B75 chipset does not support RAID. Here is a nice overview of specs of different Intel 7-Series chipsets:
Intel Z77 'Panther Point' Chipset Overview > Z77, Z75, H77, and more - TechSpot Guides
Intel's own page for B75 suggests it supports RAID:
IntelŪ B75 Express Chipset
There is a mysterious footnote without any further explanation. I cannot find any motherboard with B75 chipset which supports RAID, including Intel's own DB75EN. So my guess is that Intel's info is not correct or not clear, and that RAID is not supported on B75.